Liquid crystal polyester resin composition for camera module

a polyester resin and composition technology, applied in the field of material for camera modules, can solve the problems of reducing product pass rate and product performance, affecting product performance, and occurrence of powders (particles), and achieves the effects of good rigidity, good heat resistance, thin-wall workability and mechanical strength, and excellent surface transferability

Active Publication Date: 2012-03-27
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]The molded article formed from a liquid crystal polyester resin composition according to the present invention has good rigidity, heat resistance, thin-wall workability, and mechanical strength, and also excellent surface transferability, and surface exfoliation properties. Thus, an optimum camera module part can be provided which is capable of being surface mounted (SMT) and yet has a low level of powder (particle) occurrence during an assembly step or in use.

Problems solved by technology

Thus, for a lens barrel part, mount holder part and the like of a camera module formed from a conventional liquid crystal polymer resin composition, it is currently impossible to control the occurrence of powders (particles), which are a cause in reducing product pass rates and product performance, during a camera module assembly step and during use, while maintaining the rigidity, heat resistance, thin-wall workability, and mechanical strength as good physical properties of the liquid crystal polymer resin composition.
Further, this molding material has a low level of powder (particle) occurrence during a camera module assembly step or in use.

Method used

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  • Liquid crystal polyester resin composition for camera module
  • Liquid crystal polyester resin composition for camera module
  • Liquid crystal polyester resin composition for camera module

Examples

Experimental program
Comparison scheme
Effect test

examples

[0064]The present invention will now be described in more detail using the following examples and comparative examples. However, the present invention is not limited to these examples.

(Testing Methods)

[0065]The methods for measuring and evaluating the performance of the thermotropic liquid crystal polyester resin composition in the examples and comparative examples and the molded articles obtained therefrom are illustrated below.

(1) Measurement of Melt Viscosity

[0066]The melt viscosity of the thermotropic liquid crystal polyester resin composition was determined as the apparent viscosity at 370° C. by measuring the apparent viscosity while heating at a constant temperature increase rate of +4° C. / minute from 300° C. at a shear rate of 100 sec−1 using a capillary rheometer manufactured by Intesco Co., Ltd. (Model 2010) and also using a capillary die having a diameter of 1.00 mm, a length of 40 mm, and an inflow angle of 90°. The obtained value was taken as the test value. In the test...

production example

Production of Thermotropic Liquid Crystal Polyester C

[0075]A pre-polymer was obtained by the same method as for the thermotropic liquid crystal polyester A.

[0076]The obtained pre-polymer was subjected to solid-phase polymerization using a rotary kiln manufactured by Takasago Industry Co., Ltd. The pre-polymer was placed in the kiln. The pre-polymer was then held for 11 hours at a rotation speed of 2 rpm under a nitrogen flow at a flow rate of 16 Nm3 / hr while increasing the heater temperature over 1 hour from room temperature to 350° C. It was confirmed that the resin powder temperature in the kiln had reached 300° C., and then the heating was stopped. The resin powder was cooled over 4 hours while rotating the kiln to obtain a powdery liquid crystal polyester, which had a melting point of 370° C. and a melt viscosity of 140 Pa·S.

[0077]The inorganic fillers used in the following examples are shown below.

(1) Talc: “MS-KY” manufactured by Nippon Talc Co., Ltd., (number average particle...

example 1

[0078]Using a ribbon blender, 100 parts by mass of the powdery liquid crystal polyester A obtained in the above-described production example, 34 parts by mass of talc, 34 parts by mass of glass fiber A, and 3 parts by mass of carbon black were mixed. The resultant mixture was dried for 2 hours at 150° C. in an air oven. The dried mixture was melt kneaded at an extrusion rate of 140 kg / hr using a twin-screw extruder (PCM-30, manufactured by Ikegai Co., Ltd.) having a cylinder diameter of 30 mm with the cylinder maximum temperature set to 380° C. to obtain a pellet of the intended liquid crystal polyester resin composition. Using the obtained pellet, the various physical properties were measured by the above-described testing methods. The results are shown in Table 1.

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Abstract

A liquid crystal polyester resin composition includes, based on 100 parts by mass of a liquid crystal polyester, 15 to 60 parts by mass of talc having a number average particle size of 10 to 50 μm, 25 to 50 parts by mass of a glass fiber having a number average fiber length of 100 to 200 μm and a number average fiber diameter of 4 to 8 μm, and 2 to 10 parts by mass of carbon black, wherein a melt viscosity as determined at a shear rate of 100 sec−1 at 370° C. is 10 to 100 Pa·S and a deflection temperature under load is 220° C. or more. The liquid crystal polyester resin composition is used to provide a liquid crystal polyester resin composition for a camera module, having good heat resistance, rigidity, strength, and moldability, and also an excellent surface exfoliation property in a well balanced manner and being capable of being surface mounted (SMT).

Description

TECHNICAL FIELD[0001]The present invention relates to a material for a camera module. More specifically, the present invention relates to a liquid crystal polyester resin composition used for all of the plastic parts which can, during a production step or during use, produce dust that can land on a CMOS (image sensor), and includes, for example, a “lens barrel portion” (section where the lens is placed), a “mount holder portion” (section in which the barrel is mounted and which is fixed to the substrate), as well as a “CMOS (image sensor) frame,” and a “shutter and a shutter bobbin portion.” These portions have a high heat resistance, can withstand solder reflow, and can be surface mounted (a technology in which a material is placed on a substrate coated with a solder paste by printing and the like, and the solder melts by a reflow furnace and is fixed to the substrate. Also referred to as surface mount technology, abbreviated as “SMT”).BACKGROUND ART[0002]When transmitting AV infor...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C09K19/38C09K19/52C09K19/54C08K3/34C08K3/04C09K19/20C08K3/40
CPCC08K3/04C08K7/28G03B9/08C08K7/26C08K7/14C08L67/00C08G63/20H04N23/50
Inventor MUROUCHI, SATOSHINAKAYAMA, TOSHIOKITAI, TORU
Owner JX NIPPON OIL & ENERGY CORP
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